The basic answer would be "C".
In English grammar<span>, the </span>base form of a verb<span> is the simplest form of a </span>verb<span>, without a special ending (or </span>suffix<span>). It's the form that appears in </span>dictionary<span> entries. Also known as the </span>plain form,simple form<span>, or </span>stem<span>.</span>
For music programs, instructors can ask for videos of music being played/sung
The theme is the moral lesson of the story, the topic is what it is about
hope this helps